all the undersides have latex caulk to keep anything from seeping out.
so I did my 'test pour' in it but only filled about 3/8" deep in case A) it seeped out I wouldn't lose $400 in epoxy and B) to ensure it worked because if I needed to remove it would have been easier, and refer back to point A.
I threw in some coins, a dollar bill and a Canadian $20 about halfway thru the cure. The coins sank which I did not think they would but its fine. I used clear on the test pour so I could see what was happening. The final pour will be black.